Question

4. Define :
(a) Photochemical reaction (b) Electrochemical reaction.
Give one example in each case.
5. Give an example of each of the following chemical changes.
(a) A photochemical reaction involving
(i) silver salt (ii) water
(b) A reaction involving
(i) blue solution
(ii) formation of dirty green precipitate
(c) Two gases combine to form a white solid.
(d) Two solids combine to form a liquid.
(e) A reaction where colour change is noticed.​

Answer 1

Answer:

Photochemical reaction, a chemical reaction initiated by the absorption of energy in the form of light.

Electrochemical reaction, any process either caused or accompanied by the passage of an electric current and involving in most cases the transfer of electrons between two substances—one a solid and the other a liquid.

Explanation:

Answer 2

Answer:

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